Hi Eric,
On AIX there is the iocp, this van apparently perform the formatting for TSM,
what you see is that TSM only needs a few moments to format the volume, and
from there on IOCP takes over. On unix file systems, because they support
sparse files, the formatting must be performed. It's easy to observe this
behavior, just run nmon while formatting your volumes....
--
Remco Post
remco AT plcs DOT nl
06-248 21 622
> Op 9 sep. 2015 om 16:51 heeft Loon, EJ van (ITOPT3) - KLM <Eric-van.Loon AT
> KLM DOT COM> het volgende geschreven:
>
> Smarter way of formatting? Either it fills the files with zero's or with a
> certain text string like in 5.5, formatting takes time. Allocating a 100 Gb
> files currently takes a few seconds, so it's impossible that TSM physically
> formats a file.
> Kind regards,
> Eric van Loon
> AF/KLM Storage Engineering
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> Of Remco Post
> Sent: woensdag 9 september 2015 14:17
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: nfs mounted tsm storage becoming unavailable
>
>> Op 9 sep. 2015, om 09:11 heeft "Loon, EJ van (ITOPT3) - KLM" <Eric-van.Loon
>> AT KLM DOT COM> het volgende geschreven:
>>
>> Hi Rick!
>> Formatting the whole volume was the case in the TSM 5.5 era, but not anymore.
>
> not true, but TSM does attempt smarter ways of formatting, so it seems faster
> from your perspective.
>
> What is important is that TSM uses a particular kind of file locking,
> something that doesn't work for every combination of NFS client and server.
> See: https://www-304.ibm.com/support/docview.wss?uid=swg21470193
>
>> Formatting a diskpool or filepool volume took ages back then because it was
>> filed with a text string (my name backwards :-), but with version 6 this has
>> changed and it just pre-allocates the requested space without formatting.
>> Creating a volume is now a matter of seconds, no matter how large it is.
>> Kind regards,
>> Eric van Loon
>> AF/KLM Storage Engineering
>>
>> -----Original Message-----
>> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
>> Of Rhodes, Richard L.
>> Sent: dinsdag 8 september 2015 18:49
>> To: ADSM-L AT VM.MARIST DOT EDU
>> Subject: Re: nfs mounted tsm storage becoming unavailable
>>
>> It sounds like you are pre-defining the file vols on the NFS share.
>> If you pre-define vols I believe TSM writes the entire vol to initialize it.
>> That would be a very heavy write load. It sounds like maybe the NFS server
>> is overloaded and maybe causing I/O errors to the other TSM's.
>>
>> Are you seeing ANR errors in the actlog of any of the TSM servers when this
>> problem occurs?
>>
>> I'd check the network stats for your TSM server and NFS server.
>> Possibly getting lan errors under heavy load is causing problems.
>>
>> Are your NFS shares mounted hard? I believe they should be.
>>
>> Run around - don't pre-define vols, let TSM to create scratch vols as
>> needed.
>> That's what we do for our NFS DataDomain shares.
>>
>> Just some thoughts!
>>
>> Rick
>>
>>
>>
>> -----Original Message-----
>> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
>> Of Lee, Gary
>> Sent: Tuesday, September 08, 2015 10:38 AM
>> To: ADSM-L AT VM.MARIST DOT EDU
>> Subject: nfs mounted tsm storage becoming unavailable
>>
>> We are trying to troubleshoot a problem with our tsm disk storage.
>>
>> Tsm server 6.3.4 running on RHEL 6.5.
>> Our storage is a set of subdirectories on a file system mounted via nfs v3
>> to all three of our tsm servers.
>>
>> All goes fine until an attempt is made to define one or more volumes to a
>> storage pool.
>> At that time, if other tsm servers are writing to the storage, those volumes
>> will become red-only when the volume define is in process.
>>
>> Other operations, such as reclamation, and normal writing do not cause
>> problems.
>>
>> Our storage provider, (nexenta) is asking what tsm does when creating a
>> storage volume.
>> So, I am coming to the list for information. Just what does tsm do under
>> the covers when defining a storage volume?
>>
>> Thanks for any help.
>>
>>
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